[R-390] Tube Tester

[Veenstra, Lester]

However, to play devils advocate (and CTM)  The best tube tester is the
R-390 with a signal generator.
   Les K1YCM/3    www.r-390.com

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net] On Behalf Of djmerz at 3-cities.com
Sent: Tuesday, October 26, 2004 10:15 AM
To: Bob Camp
Cc: R-390 HF Receiver List
Subject: Re: [R-390] Tube Tester


Bob,  I would be interested in the circuit of what you propose.  Not
that I would likely end up building it but it would be "educational" to
see how simply it might be done.  There are other classes of tubes/older
stuff that it might be useful for as well,  best regards,  Dan
> Hi
>
> One of the truly amazing things about the current surplus scene is 
> that a reasonable military tube tester (say a TV-7) from the 1950's 
> sells for almost as much as a reasonable military radio (say a R-390A)

> from the same era. By the time you buy a reasonable set of test gear 
> you have invested as much or more than you put into the radio.
>
> So here's the question:
>
> Is there any interest in a "R-390A only" tube tester? As far as i can 
> see you could make one with a handful of parts that would test all the

> tubes in the R390A except the rectifiers. It should do as good a job 
> as a TV-7 on the R390A tubes. One advantage would be that the number 
> of switches involved would be small. The ease of use factor on the 
> simple tester would be significant if you check a lot of tubes.
>
> Is anybody interested in a gizmo like this? If there is then it's 
> probably worth figuring out how to do it. A lot of us already have 
> tube testers so it may not be worth doing.
>
> This would be strictly a "here's the schematic go to it" type of 
> thing. I have no intention of trying to sell them or build them. All 
> the wiring would be point to point stuff. The parts except for the 
> tube sockets would all be Radio Shack type stuff. The tester should be

> a reasonable weekend project with plenty of time taken off necessary 
> distractions like *using* radios.
>
> If you are interested let me know. The only thing I need to know is 
> weather you already have a voltmeter / current meter. If so what is 
> the lowest current range it will show? The gizmo can be designed for a

> "plug in" meter or a built in. The design will be a little different 
> depending on which way we go.
>
> Parts list (more or less):
>
> one 9 pin tube socket
> two 7 pin tube sockets
> two 6 volt filament transformers
> one push button
> one dpdt switch
> one 1N4007 diode
> 3 - 6 0.01 uf caps
> some number of resistors
> a power cord, fuse and on/off switch.
> Depending on the voting either a couple of pin jacks or a meter
>
> So any takers?
>
> 	Enjoy!
>
> 		Bob Camp
> 		KB8TQ
>
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